Startup Fails And Ends In BSOD

XP fails to start in any mode. XP has been reloaded from an image with no change in situation. (I was reimaging the machines anyway.) I have not yet had a successful boot since reimaging, and hence XP (mini)setup has not completed (the image was prepared using sysprep to allow it to be rolled out to multiple machines. These machines are connected to an 2003 AD Domain). Currently I'm running memtest86+ from Knoppix. Knoppix booted with only one error about not passing in proper display information. (Perhaps the graphics card is going?). The last file loaded in a safe mode bootup is mup.sys, which leads me further to believe that it's a hardware problem (and that's backed up by Google).

I've opened it up, cleaned it out with a little (make that a lot) of compressed air. Boy, was it dusty. I forgot to mention, this computer is at a high school, if you want an idea of what the users are like . It's a magnet/gifted/selective enrollment (for you Chicago people) high school though. Any suggestions on things to try? I didn't see anything obviously wrong on the motherboard: that is, no exploded capicitors, disconnected cables, missing RAM, etc. I'm running memtest now, however we won't know the results of that until tomorrow. I'm going to swap out the HD with a different one and we'll see if that's any better.